Merge branch 'Fix-collisions-in-socket-cookie-generation'

Daniel Borkmann says:

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Fix collisions in socket cookie generation

This change makes the socket cookie generator as a global counter
instead of per netns in order to fix cookie collisions for BPF use
cases we ran into. See main patch #1 for more details.

Given the change is small/trivial and fixes an issue we're seeing
my preference would be net tree (though it cleanly applies to
net-next as well). Went for net tree instead of bpf tree here given
the main change is in net/core/sock_diag.c, but either way would be
fine with me.

v1 -> v2:
  - Fix up commit description in patch #1, thanks Eric!
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Signed-off-by: David S. Miller <davem@davemloft.net>